Paper material.



M. A. MGGUIRE.

PAPER MATERIAL.

APPLIOATION FILED Nov.1e, 1908.

925 ,1218. Patented June 15, 1909.

v f7/form? MICHAEL A. MCGUIRE, OF CINCINNATI, OHIO.

PAPER MATERIAL.

Specification of Letters Patent.

Patented June 15, 1909.

Application led November 16, 1908. Serial No. 462,848.

To all whom it 'may concern:

Be it known that I, MICHAEL A. MoGUInE, a citizen of the United States,residing in Cincinnati, county of Hamilton, and State of Ohio, haveinvented certain new and useful Improvements in Paper Material, of whichthe followinnr is a full, clear, and eX- act description, referencebeing had to the accompanying drawing, forming part of thisspecification.

My invention relates to improvements in what is known as vulcanized berfor use in the manufacture of trunks, suit cases and the like, and ithas for its object, to render such material elastic and better adaptedto stand the strains o usage than the paper material now in use for suchpurposes.

For many Vyears it has been customary to use vulcanized ber for themanufacture of packing cases, trunks and the like, but the greatobjection to the use of the material is that when indented by roughhandling, or contact with other baggage, there is not sufcientresiliency in the material, and the depressions and marks of rough usageremain permanently.

My invention consists in embedding in the paper ber in the manner andfor the purpose to be hereinafter particularly pointed out and claimed,a mat or mesh of thin spring steel strips, whereby the necessaryresiliency will be imparted to the paper material.

In the drawin Fi re l is a perspective view of a sheet o my lmprovedpaper board, with a portion of the upper portion of the sheet removeddown to the steel mat. Fig. 2 is a cross section of the same.

In carrying out my invention, I rst weave a mat of thin and fiat stripsof spring steel 1 and 2, as shown in Fig. 1, and this mat is thensubjected to a bath ofgrained shellac varnish to render same thoroughlywater proof. I then take sheets of vulcanized ber paper material-andsubject them to a steamvging process'to thoroughly soften and I then dryone side of each sheet by subjecting same to heat, and I then lay thesteel mat between the two sheets with the dried surface toward the mat,and then subject the sheets to hydraulic pressure, which forms onehomogeneous mass of ber material 3, with the steel springsembedded inthe mass, so that a new sheet of vulcanized ber results with the steelstrips an integral part of the paper board.

Instead of making use of vulcanized ber material after the same has beenmanufactured, and is ready for use, and then softening saine by steam,the spring steel mat may be embedded in the ber during theprocess of themanufacture of the ber material. That is to say, after the treatment ofthe paper pulp by which the vulcanizin is effected, and before thesheets are ro led or subjected to other pressure, and while the sheetsare still soft, the mat may be embedded between the sheets.

I am aware that it is old to embed wire mesh in paper pulp fabric, butthe embedding of such wire mesh in vulcanized ber material, would notimpart to the vulcanized ber the quality of elasticity which willovercome the objections above referred to in the use of such materialfor the manufacture of trunks, packing cases and the like.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is:

1. As a new article of manufacture, elastic sheet material consisting offlat spring steel' strips interlaced together to form at mat com letelyembedded in layers of Vulcanized ber whereby at contacting surfaces areprovided to permit of the ready adherence of the layers of vulcanizedber substantially as described.

2. The process of manufacturing elastic sheet material for trunks andthe like, which consists in softening sheets of vulcanized ber by theapplication of steam, then drying one side of each sheet by theapplication of heat, then laying a mat vof spring steel stripspreviously subjected to a ath of anti-rust material between the softenedsheets with dried 'sides together, and then uniting the sheetsWitnesses:

ROBERT P. I-IAnerr'r, 4Bassin A. BEAU..

